#include "stm32f10x.h" 
#include "stm32f10x_it.h" 
#include <sys/clock.h>
#include <sys/cc.h>
#include <sys/etimer.h>
#include <uart.h>

static volatile clock_time_t current_clock = 0;
static volatile unsigned long current_seconds = 0;
static unsigned int second_countdown = CLOCK_SECOND;

//void SysTick_handler(void) __attribute__ ((interrupt));

void clock_init() 
{ 
   if (SysTick_Config(SystemCoreClock / CLOCK_SECOND)) 
  {   
      while (1); 
  } 
} 
void SysTick_Handler(void) 
{ 
   current_clock++; 
   if(etimer_pending() && etimer_next_expiration_time() <= current_clock) { 
    etimer_request_poll(); 
     // printf("%d,%d\n", clock_time(),etimer_next_expiration_time     ());   
  } 
   if (--second_countdown == 0) { 
     current_seconds++; 
     second_countdown = CLOCK_SECOND; 
  } 
} 

clock_time_t
clock_time(void)
{
  return current_clock;
}

#if 0
/* The inner loop takes 4 cycles. The outer 5+SPIN_COUNT*4. */

#define SPIN_TIME 2 /* us */
#define SPIN_COUNT (((MCK*SPIN_TIME/1000000)-5)/4)

#ifndef __MAKING_DEPS__

void
clock_delay(unsigned int t)
{
#ifdef __THUMBEL__ 
  asm volatile("1: mov r1,%2\n2:\tsub r1,#1\n\tbne 2b\n\tsub %0,#1\n\tbne 1b\n":"=l"(t):"0"(t),"l"(SPIN_COUNT));
#else
#error Must be compiled in thumb mode
#endif
}
#endif
#endif /* __MAKING_DEPS__ */

unsigned long
clock_seconds(void)
{
  return current_seconds;
}
